I can tell ya that with my 28' cruiser, 4 electric trailer brakes and huge killer 4 wheel disc on my dually, half a dozen panic stops with the winch cable TIGHT won't move it 2" forward...
You either need to jack it up like with a floor jack and a block of wood under the keel about 2/5 from rear to front.... doesn't need to leave the trailer, just make it lighter or take it to the ramp.... I'd suggest no more than 20 mph MAX though as when it does go bad, it happens fast... better safe than sorry
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